public void To(Action <TContext, T> action)
{
Expression getValueExpression = _sourceExpression.Body;
var contextParameter = _sourceExpression.Parameters[0];
if (_propagateNullValues)
{
getValueExpression = new NullPropagationVisitor(contextParameter).Visit(_sourceExpression.Body);
}
var finalExpression = Expression.Lambda <Action <TContext> >(
Expression.Call(
Expression.Constant(action),
typeof(Action <TContext, T>).GetMethod("Invoke"),
contextParameter,
getValueExpression),
contextParameter);
AddRule(Binder.ExpressionCompiler.Compile(finalExpression), _key);
}
internal void SetTarget <TTarget>(Expression <Func <TContext, TTarget> > targetExpression)
{
var contextParameter = _sourceExpression.Parameters[0];
var source = _sourceExpression.Body;
if (_propagateNullValues)
{
source = new NullPropagationVisitor(_sourceExpression.Parameters[0]).Visit(source);
}
var target = targetExpression.GetBodyWithReplacedParameter(contextParameter);
if (!target.Type.IsAssignableFrom(source.Type) || source.Type.IsValueType && Nullable.GetUnderlyingType(target.Type) == source.Type)
{
source = Expression.Convert(source, target.Type);
}
var assignment = Expression.Lambda <Action <TContext> >(
Expression.Assign(
target,
source),
contextParameter);
var key = _key ?? targetExpression.GetTargetKey();
var targetParent = ((MemberExpression)targetExpression.Body).Expression;
var targetParameter = targetExpression.Parameters[0];
if (targetParent != targetParameter)
{
_dependencies.Add(targetParent);
}
AddRule(Binder.ExpressionCompiler.Compile(assignment), key);
}
public NullPropagationVisitorTest()
{
visitor = new NullPropagationVisitor(recursive: true);
visitorNonRecursive = new NullPropagationVisitor(recursive: false);
}
